The correct relationships between unit cell edge length ‘a’ and radius of sphere ‘r’ for face-centred and body-centred cubic structures respectively are: (A) 2 2 r = a and 4r = 3 a (B) r = 2 2 a and 3

Question

The correct relationships between unit cell edge length ‘a’ and radius of sphere ‘r’ for face-centred and body-centred cubic structures respectively are:

(A) 2 2 r = a and 4r = 3 a
(B) r = 2 2 a and 3 r = 4a
(C) r = 2 2 a and 4r = 3 a
(D) 2 2 r = a and 3 r = 4a

Prashant Kotian · Accepted Answer

Correct answer: A. F.C.C. a = 4r for BCC a = 4r r 2 r a  

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